Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Data Collection and Analysis Information.
| Category | Content |
|---|---|
| Keywords | Pfizer, Moderna, Janssen, AstraZeneca |
| Periods | Phase 1 (19 January.2022~18 April 2020) Phase 2 (1 January 2021~31 March 2021) Phase 3 (24 October 2021~23 January 2022) |
| Channels | Naver, Daum, Google, Twitter |
| Software | Textom 5.0 |
